If x^2 + y^2 = 100, and x≥0, and y≥0, the maximum value of x + y is
A. Less than 10 B. Greater than or equal to 10 and less than 14 C. Greater than 14 and less than 19 D. Greater than 19 and less than 23 E. Greater than 23
The scores of A and B in an examination are in the ratio 11 : 14. After an appeal, their scores increase by the same amount and their new scores are in the ratio 47 : 56. The ratio of B’s new score to that of his original score is